A reconfigurable optical add-drop multiplexing means

Examples of embodiment of the present invention there is provided a reconfigurable optical add-drop multiplexing device relates to the field of communications, to address the problem of inconvenient line fault detection. The ROADM apparatus comprising: a first ROADM, a second ROADM, a branching coupler, an optical amplifier and four four couplers. Examples of the present invention for the communication line architecture.